Tagged Questions

Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed references.

135 views

How can i convert the coordinates (latitude,longitude) to X,Y using postgis

I want know how i can convert the latitude and the longitude coordinates of a rectangle in the Cartesian coordinates, so I can store them in a geometry field using postgis.
39 views

Forming a uniform grid of GPS coordinates from a starting GPS coordinate

I'm trying to find a method in which I can form a uniform 2D grid, relative to a starting GPS coordinate. See the diagram below The red point represents the starting GPS Coordinate, which can be ...
18 views

Grid doesn't show up in printer composer

I am trying to get a coordinate grid on my map with the printer composer. I have tried every example and followed it exactly but for some reason the grid doesn't show up at all. I am working with Qgis ...
38 views

Find Lat and Long points on land only

I'm new to R and GIS so please forgive me if this is a simple request. I was looking for a way to find out if a Lat/Long point is on land or ocean. I found this previous post from a couple of years ...
45 views

Extracting polygon coordinates from only two specific corners

End goal: To add two (or 4) fields to a polygon grid feature class which will contain coordinates of the lower left (southwest) and upper right (northeast) corners of each grid. I have a feature ...
75 views

Generating random points near a location [closed]

In the following solution, why is there a sqrt(u)? Since u is just a random number in [0, 1) doesn't getting the sqrt just give you another smaller random number? To generate points uniformly, ...
39 views

Point coordinate shift after python toolbox processing

I am working on custom clustering in ArcMap. For it I have created a python toolbox, where I do the processing. However, as a result I get slightly shifted points (6-20 meters), while they shall stay ...
19 views

Create pointe layer with table [duplicate]

I have a table with 13,000 points of geographic coordinates ( degrees, minutes , seconds) How I can create a layer of points ? QGIS or Arcgis . it is possible to create a layer of points with ...
72 views

How can I get the outline coordinates of bodies of water in a country? (Lakes, River, ponds) From Google Maps or any other data set [closed]

I'm in need of acquiring the coordinates of the outlines of all the water bodies inside a country, with the exception of "Sea" or "Ocean" water. Right now, I'm manually outlining the lakes and rivers ...
19 views

Create points with planar location data

Slightly confused. I need to add 3 point features to an already created map project (state plane projection). The description given to me about the location of the points is the planar location, so no ...
42 views

PTV_Mercator correctly recalculated to WGS84 EPGS:4326 but not correct on map

I have recalculated PTV_Mercator (PTV Spherical Mercator EPSG:505456) coordinates to WGS84 EPGS:4326 coordinates in Excel. And when checking them on Google Maps they show up correct. But after ...
84 views

Accessing array of x,y coordinates stored as MDSYS.SDO_GEOMETRY / PUBLIC.SDO_GEOMETRY attribute in Oracle 11g?

I am totally new to GIS. I am working with a table in an Oracle 11g database. In each row of this table there are two attributes of interest: one is of type MDSYS.SDO_GEOMETRY and the other PUBLIC....
20 views

Merging Raster Images Changes Its Coordinates

I'm trying to merge raster files (Landsat images) for the island of Sumatra, Indonesia. When I upload each raster file to check if I have all of the island covered, I get this: However, when I use ...
97 views

Unusual behavior of coordinate grid in QGis Composer

The coordinates in the grid in QGis composer display incorrectly when using the "degrees, minutes, seconds" option (or even decimal degrees). It displays West and East in the longitude and North and ...
61 views

Unknown set of coordinates Northing Westing

I've been given a list of sites of vegetation with a "Northing/Westing" location e.g 52 43.569 - 001 44.833 I want to convert them to Easting Northing so I can load them into ArcMap. I've tried to ...
60 views

creating a single point from coordinates

I need a simple way to enter or create a point from a set of coordinates on a geo referenced photomap in QGIS. The points are shipwreck coordinates that are then visually aligned with the reef ...
79 views

Extracting coordinates from mapinfo map window [closed]

I didn't have time to go the field to collect GPS coordinates but I have knowledge from the map where the boundary of the land of nearly 20000 hectares will follow and therefore I wish to extract ...
37 views

Get coordinates of Near Tool output

I have a polygon layer and a polyline layer. I got the centroids of the polygon layer and used the Near Tool to find the distance from the closest point from the centroids to the polyline layer. One ...
115 views

Shifting LiDAR point clouds that have been incorrectly georeferenced

I am new to LiDAR and have never been a part of the LiDAR data pre-processing stage and hence, this question. I have two LiDAR point clouds (.las files) of a densely forested area that were captured ...
601 views

Open Layers: Get Coordinates of drawn features

Can someone help in finding coordinates of drawn features? I am using this example OpenLayers website. I need to be able to export drawn objects as set of coordinates. Posting the code from the ...
53 views

Add points at specific gps coordinates in qgis [duplicate]

I created a layer in order to draw points with the azimut and distance plugin. IT didnt work at all. There was not even 1 point created. I followed the tutorial here: http://www.teuderun.de/workshops/...
55 views

How GPS coordinates grows?

I'm working on a project which uses GPS coordinates. I have a UAV that flies, for example, over a meridian or a parallel. I suppose that the coordinates I'm reading from UAV are always increasing or ...
146 views

Find rectangle around point with python?

Given a point, latitude and longitude, how would one find the coordinates of a rectangle centered on that point with a known width and height in meters? I tried using the Geodesic stuff from ...
60 views

How to calculate X and Y coordinate of a surfacic layer in QGIS

I have a surfacic layer in QGIS 2.12.3. I need to calculate the X and Y coordinates for the centroid of my polygons. I created a new field in my attribute table. When I try to use the field calculator,...
38 views

Converting Lat/Long coordinates to ESRI format

Currently I have a CSV file which has Lat/Long coordinates which I got from the batch geocoding site, http://www.findlatitudeandlongitude.com/batch-geocode/#.VkWv97fNy70. I believe these are ...
31 views

Grid References Third and Sixth Figures

With Grid References, what can the range be for the third and sixth figures (the tenths of the area squares) be? 1-10, 0-10, 1-9 or 0-9? So if I had two grid squares like this, where X marks the spot:...
49 views

proj4js with geocentric CRS

I am developing a little web app to transform coordinates between CRSs. To do that I am using proj4js, but I notice that proj4js can't work with geocentric CRSs. Is there another tool similar to ...
23 views

Geodesic replacement of coordinates [duplicate]

With a updatecursor I can move vertex to a new location and modify polygons. For a simpele example I tried to move the world, see image. The black lines are the 'edges' of world (180,90 -180,-90 ,-...
41 views

Calculating distance between points from table of UIDs [ArcMap]

I have a .dbf file containing pairs of point feature Unique Identifiers (UIDs), and need to calculate the straight-line distance between each of these pairs. The XY coordinates of the individual ...
63 views

Georeference dwg file in arcmap

I have a dwg file and I want to georeference it with ArcMap. I have 4 coordinates given (in Degrees and Lambert), so I should be able to reference it. I used the georeferencing tool in ArcMap, but I ...
200 views

Can QGIS plot coordinates in Degrees-Minutes format?

I have a .csv file of coordinates that looks like this: Is there a way for QGIS to plot coordinates formatted like this? I've tried Adding a Delimited Text Layer... in QGIS, but do not see any ...
95 views

GPS points displaying in the wrong place [closed]

I'm trying to help a student by importing an excel table of Lats and Longs into Arcmap, but they are displaying in the wrong location - I am also a bit suspicious of the coordinates. I imported the ...
137 views

Why do my points end up in Africa? (should be Croatia)

I have the correct coordinates in a excel file, but when I import the file, the point always goes to the wrong place. (I need it in Croatia, and it puts the point in Africa) I've tried chaging CRS ...
38 views

Add a Delimited Text Layer in QGIS [duplicate]

Does anyone know how to put manually decimal coordinates in QGIS 2.12.3 Lyon? I have the georeferenced topographic map. I've tried to add feature point and then change the coordinates of the point but ...
70 views

Show coordinates in other projections (ArcGIS Javascript API)

Is it possible to change this sample that it will be show x,y coordinates in wkid:5514 ? <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"> <...
65 views

How to perform statistical test for two sets of points?

(I have asked this question originally on Cross Validated; however, no good answer and someone suggested me to ask the question here). We know that we can perform statistical test (e.g., t-test) for ...
21 views

i am looking for a simple app that will record gps coordinates against photos and videos [closed]

is there a simple app that will allow my Android phone to record not just a location name against photos and videos, but also the gps coordinates?
70 views

Rotate polygons in JavaScript using openlayers

I want to know some ways for rotating polygons. I already success using spring and server, but what I want to do is rotating polygons using 'only' Javascript and openLayers3, not using server. Here ...
48 views

How to create a shapefile from Excel file including coordinates of points and distances between them in ArcGIS?

I wanted to use network analyst in ArcGIS and I have coordinates of points in the network. However, I could not find a shapefile including road information between these points so far (length of links ...
128 views

Creating polygon regions with latitude and longitude values in qgis?

I've a set of places with their latitudes and longitudes, I've plotted them on QGIS but what I want is to create polygon from these points so that each point refers to a particular region around it. ...
103 views

x, y to decimal degrees on mouse click in ArcObjects?

I am converting an old VBA code I used to use in ArcMap 9.2, into VB.NET for ArcMap 10. It should extract x, y coordinates from OSGB and converts to decimal degrees while copying to clipboard. I ...
77 views

QGIS export feature coordinates

I have a big project (whole country) and it contains smaller features (administrative units). My project is in .shp. How to export features' coordinates one by one or all at once as long as all ...
77 views

How to get the coordinates of the x-axis from a profile graph in Arcmap?

I have done already a profile graph in ArcMap drawing a diagonal line over a DEM image. Now I would like to add some point locations as it is showed in the attached figure. I set these blue points in ...
58 views

updating Z coordinates of points in polylines

I have a polyline feature dataset with Z coordinates. I'd like to change the Z values (e.g.) by adding 10 meters. I am trying the following code, but no changes happen. It seems the code is able to ...
43 views

How to create a grid point layer from a txt file in QGIS?

I have a ascii file (.txt) with the following columns ID, long, lati, value where long, lati are the coordinates (long/lat) of the cell centres of a LAT/LON grid with resolution of 30 arc seconds. ...
46 views

Extract coordinates of corner cells of a shape file in python script (QGIS)?

I have a grid in a Lambert Conformal Conic projection (with columns: ID, value) and I want to extract the corners of each cell in the native projection of the grid with QGIS. In particular, I want the ...
35 views

Zoom to predefined areas/extents in QGIS [duplicate]

Is there anyway or any plugin to create predefined extents/areas (e.g. cities) that one can zoom to in QGIS? For example, create a city A, define the extents of the city and when one click on the ...
45 views

Convert xyz coordinates to lon/lat to calculate height change GPS time-series data [duplicate]

How can I convert the XYZ coordinates in Lat, lon to calculate height in metric system? XYZ ascii site YYMMMDD yyyy.yyyy __MJD week d reflon _e0(m) __east(m) ____n0(m) _north(m) u0(m) ____up(m) _ant(...